If you were calculating a forecast using an exponential smoothing model,a calculation using a = 0.2 would be putting a greater emphasis on recent data,while a calculation using a = 0.8 would be putting a greater emphasis on past data.Thus a lower a is more responsive to changes in demand in the most recent periods.

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In exponential smoothing, a higher alpha (α) value like 0.8 puts more emphasis on recent data, making it more responsive to changes, while a lower alpha like 0.2 emphasizes past data more.

If You Were Calculating a Forecast Using an Exponential Smoothing